Gas Flow Issue and Keeping the Jeep running

[AtlantaCj7]

Issue 1: I am having a problem with my 80' cj, the gas is not flowing through to the fuel pump. I pulled the line from the tank to the pump and turned it over a couple of times, but no gas. When connected to the pump, there is no fuel getting to the carb either. I have replaced the fuel filter so I don't think its that. I feel like its maybe a crack in the line or a blockage in the tank? I bought a new fuel pump and it still didnt do anything...I am pretty new to the jeep world but I want to fix it on my own. I don't fully understand how to check for vaccum leaks...i understand the overall idea that it needs a vaccum to suck the fuel in, but need some advise...

Issue 2: Before that issue came up, i had an issue keeping the jeep running...It ran great for a while, and then I replaced the valve cover, in an attempt to stop oil leaking out of the cover. since then it would crank up, and idle fine, but when i pulled it down the drive, and ran it up the street, it would die, within 1/4 mile. I had to crank it up several times just toget it back into the garage...anyone experience this? Any advise or thoughts on this?

much thanks!

 

[Torxhead]

You could have issues with the fuel tank pickup sock, vent system, or cracked fuel line.

 

[duffer]

First, I'm not that familiar with the newer CJ's so take this for what's worth. I see two possibilities here:

1) and most likely, a plugged intake in the tank, and 2) problems with the charcoal canister system that could cause a vacuum in the tank.

Number 2 can easily be diagnosed by just trying to run it with a loose gas cap. Number 1 may be temporarily fixed by putting a little compressed air in the tank fuel line on the tank side of the fuel pump. That will usually clear the obstruction in the pick-up but all that stuff is still in the tank and will likely plug it again. Eventually the tank will need either cleaned or replaced.

 

[duffer]

And TAKE THE GAS CAP OFF BEFORE PUTTING ANY AIR TO THAT LINE!

 

[ecessg]

check for a kinked line coming off the fuel tank. i replaced my tank recently, and inadvertently had a sharp bend in the line coming off the top of the tank. it would crank up and act ok for a bit, but would die soon after.